Fabricjsvideo和摄像头

video被看做图片处理 new fabric.Image

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Document</title>
  <style>
    .canvas-container {
      border: 1px dotted #ccc;
      display: inline-block;
      vertical-align: top;
      -webkit-tap-highlight-color: rgba(0, 0, 0, 0);

      width: 1200px;
      height: 700px;
      position: relative;
      user-select: none;
    }

    #c {
      border: 1px solid rgb(204, 204, 204);
      position: absolute;
      width: 1200px;
      height: 700px;
      left: 0px;
      top: 0px;
      touch-action: none;
      user-select: none;
    }
  </style>
  <script src="../fabric.js"></script>
</head>

<body>
  <video id="video1" muted height="360" width="480">
    <source src="https://cloud.video.taobao.com/play/u/828291614/p/1/e/6/t/1/333154089379.mp4" />
  </video>
  <video id="webcam" height="360" width="500" style="display: none"></video>
  <div class="canvas-container">
    <canvas id="c" width="1200" height="700"></canvas>
  </div>
  <script>
    var canvas = new fabric.Canvas('c');
    var video1El = document.getElementById('video1');
    var webcamEl = document.getElementById('webcam');
    var video1 = new fabric.Image(video1El, {
      left: 200,
      top: 300,
      angle: -15,
      originX: 'center',
      originY: 'center',
      objectCaching: false
    });
    var webcam = new fabric.Image(webcamEl, {
      left: 539,
      top: 328,
      angle: 94.5,
      originX: 'center',
      originY: 'center',
      objectCaching: false
    });
    canvas.add(video1);
    video1.getElement().play();
    //下面是摄像头相关内容
    if (navigator.mediaDevices === undefined) {
      navigator.mediaDevices = {};
    }
    if (navigator.mediaDevices.getUserMedia === undefined) {
      navigator.mediaDevices.getUserMedia = function(constraints) {
        var getUserMedia =
          navigator.webkitGetUserMedia ||
          navigator.mozGetUserMedia ||
          navigator.msGetUserMedia;
        if (!getUserMedia) {
          return Promise.reject(
            new Error('getUserMedia is not implemented in this browser')
          );
        }
        return new Promise(function(resolve, reject) {
          getUserMedia.call(navigator, constraints, resolve, reject);
        });
      };
    }
    navigator.mediaDevices
      .getUserMedia({ video: true })
      .then(function getWebcamAllowed(localMediaStream) {
        webcamEl.srcObject = localMediaStream;
        canvas.add(webcam);
        webcam.moveTo(0);
        webcam.getElement().play();
      })
      .catch(function getWebcamAllowed(e) {});
    fabric.util.requestAnimFrame(function render() {
      canvas.renderAll();
      fabric.util.requestAnimFrame(render);
    });
  </script>
</body>

</html>

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原文地址：https://www.cnblogs.com/em2464/p/16081682.html